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I have a customer who has an oil fired boiler with a Williamson 46 gallon indirect water heater. His relief valve keeps popping off every few days. Oil company replaced the relief valve, fill valve and extrol (set close to 15 PSI). The problem keeps happening. The indirect has been checked of leaks (back filling the boiler) and is fine. The water feed valve has been turned off for a while now and the relief valve keeps popping off.
I placed a pressure gauge with a pressure spike needle on one of the zones to check it against the boiler gauge, they both are reading the same pressure, around 15 PSI.
I was at his house the other day about an unrelated issue and found the gauge spiked to over 60 PSI. After resetting the needle to 15 PSI. While working near the boiler (which is only making hot water now), it turned on and gauge spiked to 80 PSI, while the pressure gauge only went to about 29 PSI and the relief valve started to trickle.
Could the circulator for the indirect (Taco 0011) add that much pressure to the system to pop the relief valve?
I can not think of anything else that could cause this. I hope someone can think of something that I'am missing.